feat(AvatarStack): add style prop

[hussam-i-am]

Relates to https://github.com/github/collaboration-workflows-flex/issues/1297

Changelog

New

Changed

• Noticed that AvatarStack did not have the style prop available, so adding it to be consistent with other components

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: d273943

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Minor

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	104.45 KB (+0.03% 🔺)
packages/react/dist/browser.umd.js	104.83 KB (+0.1% 🔺)

[joshblack]

Thanks for doing this! If you have a sec, could you add a test for this, as well?